Plate roll bending machine is a machine tool for continuous bending of the plate, with the function of rolling O-type, U-shaped, multi-segment R and other different shapes of the plate.
Three-roll bending machine has mechanical and hydraulic type.
Mechanical three-roll bendng machine is divided into symmetrical and asymmetrical type.
The metal sheet can be rolled into a circular, curved and tapered workpiece within a certain range by rolling machine.
Plate roll bending machine also been called plate rolling machine or plate bending machine.
Working principle of roll bending machine:
The upper roller of symmetrical plate rolling machine do vertical movement at the center of two lower roller via the hydraulic oil in the cylinder acting on the piston. Through the final reduction gear of main reducer to drive two lower roller gearing and make rotary motion, to provide torque for the rolling plate.
The flattened plastic sheet of metal is passed between the three work rolls (two lower rollers and one upper roll) of the roll machine, and by means of the upper roller’s press and lower roller’s rotary to realize continuous bending (inner layer compression deformation, the middle remain the same, the outer stretch deformation), resulting in permanent plastic deformation, rolled into the required cylinder, cone or a part of them.
The disadvantage of hydraulic three-roll bending machine is that the pre-bending of the end of the plate need with the help of other equipment.
The plate rolling machine is suitable for large roll bending machine with the thickness of 50mm or more. The bottom part of the lower roller is added with a row of fixed rollers to shorten the span of the two rollers, thus improving the precision of the workpiece and the overall performance of the machine.
Classification of roll bending machine
Roll bending machine can be divided into different types due to the use in different industries.
From the number of rollers is divided into three-roll bending machine and four-roll bending machine.
Three roller bending machine is divided into symmetrical 3-roll bending machine, level down three roller bending machine, arc down rolling machine, upper roller universal three-roll bending machine, hydraulic CNC bending machine.
From the transmission it is divided into mechanical and hydraulic rolling machine.
From the development of the roll bending machine, upper roller universal three-roll bending machine is the most backward, level down three roller bending machine slightly advanced, arc down rolling machine is the most advanced.
Three rolls bending machine
Three roll plate rolling machine include:
1. Mechanical three-roll coiling machine is divided into symmetrical and asymmetrical
Mechanical three roller symmetrical
The structure of the machine is three-roller symmetrical, the upper roller in the center of the two rollers under the symmetrical position for vertical movements, through the screw lead the worm gear drive, the two rollers for the rotary motion, through the reducer output gear and the lower roller gear meshing to provide torque for the rolled plate. The shortcomings of the machine is the end of the plate need other equipment to realize pre-bending.
Mechanical three rollers asymmetrical
The machine structure is three-roll asymmetrical, the upper roller is the main drive, the lower roller make the vertical movement, in order to clamp the plate, and through the lower roller gear and the upper roller gear meshing; the side roller does the vertical movement, with pre-bending and round rolling function. Compact structure, easy operation, and maintenance.
Hydraulic plate rolling machine
Features of hydraulic three rollers symmetrical bending machine: the machine can do the vertical movement. It is realized by the hydraulic oil in cylinder drive piston rod. The lower roller for the rotation drive, through the reducer output gear meshing, to provide torque for the rolling plate, the bottom part of the roller has carrier roller and can be adjusted. The upper roller is in the drum shape, improve the straightness of the finished product, suitable for the tank with long size and various cross-shape.
Up adjust symmetrical three-roll coiling machine is able to roll metal plate into circular, curved and tapered shape within a certain range. The lower roller of the machine is the driving roller and the upper roller is the driven roller. It is widely used in shipbuilding, boiler, aviation, hydropower, chemical, metal structure and machinery manufacturing industry.